Most Perl modules with regression tests use Test::More as infrastructure for writing and running those tests.
It has an easy,
procedural syntax for writing comparisons of results to expectations.

Most of the Test::More functions allow the programmer to add an optional label that describes what each test is trying to judge.
When a test goes wrong,
these labels are very useful for quickly determining where the problem originated.

This policy enforces that all Test::More functions have labels where applicable.
This only applies to code that has a use Test::More or require Test::More declaration (see below to add more test modules to the list).

A list of additional modules to require label parameters be passed to their methods can be specified with the modules option.
The list must consist of whitespace-delimited,
fully-qualified module names.
For example: